A little late (and probably not necessary at this point), but if you want a batch of a particular gasket (like 10 or 12), you can get it through a real parts store. I worked at a parts store in the late '70s, and the drag guys would come in to buy a bunch of timing cover gaskets at a time. We could order them that way. I don't know if parts stores can handle that, anymore. I do know that if you go into a BORG, and want to buy two items, one with cash, and the other on a credit card, there may be a meltdown in cashierland.
It was pretty sad listening to the guy on the other end of the phone tapping on keys and muttering that he could not find a Turbo 400 anywhere. Asked him to just look up my 68 Riv. Then he ask which trans it has, Ahhh TH 400? Finally he says he has a kit. For 10.00 I just bought it to move the project along.